
exports.Maybe = class MayBe {
    static of (value) {
      return new MayBe(value)
    }
  
    constructor (value) {
      this._value = value
    }
  
    map (fn) {
      return this.isNothing() ? MayBe.of(null) : MayBe.of(fn(this._value))
    }
  
    isNothing () {
      return this._value === null || this._value === undefined
    }
}

exports.Container = class Container {
    static of (value) {
        return new Container(value)
    }

    constructor (value) {
        this._value = value
    }

    map (fn) {
        return Container.of(fn(this._value))
    }
}
  